WHAT MARTIN COOK OF CHISELSPEED S AYS…

First out of the gate with dedicated expansion chambers for the Quattrini kit are Chiselspeed Tuning. We asked Martin Cook about his initial thoughts on fitting the kit and the performance of his new expansion chambers.

“Having fitted and dynoed the Quattrini M-210-TV, I have to say we’re very impressed. We’d seen some reports about the barrel overhanging the casing but this wasn’t an issue with the standard Italian Li125 case we used as a test bed. The only work required was a matching job to barrel and there was no need for any welding around the transfer ports. We used a 117mm rod in a 58mm Stroke crank, Mikuni TMX-28 carb and our CST10 exhaust, getting initial readings of 24bhp and 20lb-ft of torque. That’s more bhp and torque than an RB20 as standard, especially at lower rev ranges. My only concern with the kit was that its compression ratio of 13:1 seemed high for regular use. We’ve taken that down to 11:1 which has resulted in a very slight loss of power, but I believe the result is an engine that’s more sustainable in daily use. Straight out of the box it’s a very impressive piece of engineering but I’m confident it has more to offer.”

Chiselspeed’s expansion chamber is currently the only one designed specifically for the kit and comes in two configurations. The CST10 is designed for touring and develops low end torque while the CST11 is the fast road version.

Both exhausts are produced in the UK exclusively for Chiselspeed and are priced at £325 including VAT. For more details visit www.chiselspeed.co.uk